Update GitHub Actions workflows. (#789)

This PR was triggered by @t0yv0 generated by the
update-workflows-ecosystem-providers workflow in the pulumi/ci-mgmt
repo, from commit
[7dff4f888cb6e5bfa153146d3658d3e86ba74c6f](7dff4f888c).

Co-authored-by: Pulumi Bot <bot@pulumi.com>

.github/workflows/lint.yml

@@ -53,7 +53,7 @@ jobs:
       env:
         MISE_FETCH_REMOTE_VERSIONS_TIMEOUT: 30s
       with:
-        version: 2026.2.15
+        version: 2026.3.7
         github_token: ${{ steps.app-auth.outputs.token }}
         cache_save: false # A different job handles caching our tools.
     - name: prepare workspace